From: P729 (p729@cox.net)
Date: Tue Jun 01 2004 - 17:26:58 GMT-3
I'd recommend keeping the core as fast and streamlined as possible--perhaps
minimal ACL's to guard against potential errors in ACL's made in the
distribution layer(s) not under your administrative control. I wouldn't go
so far as to say keep QoS out of the core completely: I'd push
classification and policy enforcement out as far to the edge as
possible/practical--at least to the distribution layer and use QoS only for
queue management in the core (set the trust boundary at the distribution
layer to protect the core and keep it fast). Oversubscription? If you have a
robust and diverse core, you may want to consider expected service levels
during potential outages and perhaps keep critical links _under_subscribed
by a certain amount.
Regards,
Mas Kato
https://ecardfile.com/id/mkato
----- Original Message -----
From: "Kenneth Wygand" <KWygand@customonline.com>
To: "Group Study" <ccielab@groupstudy.com>
Sent: Tuesday, June 01, 2004 8:47 AM
Subject: Connecting two core switches / Design
> Hello all,
>
>
>
> I was thinking about large providers that need to connect core switches
> at very fast speeds. For example, say I have two 6506 core switches I
> wanted to connect in the backbone. Say each one is terminating 20 - 30
> fiber gigabit speed links. I would think it would be a poor idea to
> oversubscribe the link between these switches to a 1GBit or even 10GBit
> link. If the link was oversubscribed, logic would think that QoS should
> be employed here to make sure critical traffic (voice, video) gets
> through first, but all design guides point towards keeping all QoS out
> of the core to simply switch packets as fast as possible...
>
>
> What is recommended and is there any documentation / experience anyone
> can contribute?
>
>
>
> Thanks!
>
>
>
> Kenneth E. Wygand
> Systems Engineer, Project Services
>
> CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
> Network+, A+
> Custom Computer Specialists, Inc.
>
> "I am not really smart. I just stick with problems longer."
> -Albert Einstein
>
>
>
> Custom Computer Specialists, Inc.
>
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>
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